Evaluate 4 (a2 + 2b) - 2b when a = 2 and b = - 2.

DONE

4

Step-by-step explanation:

Firstly simplify your brackets ...,

; 4 (a^2 + 2b) = 4a^2 + 8b ... then substitute it onto the bracket

; 4a^2 + 8b - 2b

; 4a^2 + 6b ..., then substitute with the given values of a and b

; 4 (2) ^2) + 6 (-2)

; 16 - 12 = 4